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2026-10-22 09:23:54 +08:00
commit 63f557a39f
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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2011 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include "main.h"
+
+#ifdef EIGEN_EXCEPTIONS
+#define VERIFY_THROWS_BADALLOC(a)                         \
+  {                                                       \
+    bool threw = false;                                   \
+    try {                                                 \
+      a;                                                  \
+    } catch (std::bad_alloc&) {                           \
+      threw = true;                                       \
+    }                                                     \
+    VERIFY(threw && "should have thrown bad_alloc: " #a); \
+  }
+#else
+// No way to catch a bad alloc - program terminates.
+#define VERIFY_THROWS_BADALLOC(a)
+#endif
+
+template <typename MatrixType>
+void triggerMatrixBadAlloc(Index rows, Index cols) {
+  VERIFY_THROWS_BADALLOC(MatrixType m(rows, cols));
+  VERIFY_THROWS_BADALLOC(MatrixType m; m.resize(rows, cols));
+  VERIFY_THROWS_BADALLOC(MatrixType m; m.conservativeResize(rows, cols));
+}
+
+template <typename VectorType>
+void triggerVectorBadAlloc(Index size) {
+  VERIFY_THROWS_BADALLOC(VectorType v(size));
+  VERIFY_THROWS_BADALLOC(VectorType v; v.resize(size));
+  VERIFY_THROWS_BADALLOC(VectorType v; v.conservativeResize(size));
+}
+
+EIGEN_DECLARE_TEST(sizeoverflow) {
+  // there are 2 levels of overflow checking. first in PlainObjectBase.h we check for overflow in rows*cols
+  // computations. this is tested in tests of the form times_itself_gives_0 * times_itself_gives_0 Then in Memory.h we
+  // check for overflow in size * sizeof(T) computations. this is tested in tests of the form times_4_gives_0 *
+  // sizeof(float)
+
+  size_t times_itself_gives_0 = size_t(1) << (8 * sizeof(Index) / 2);
+  VERIFY(times_itself_gives_0 * times_itself_gives_0 == 0);
+
+  size_t times_4_gives_0 = size_t(1) << (8 * sizeof(Index) - 2);
+  VERIFY(times_4_gives_0 * 4 == 0);
+
+  size_t times_8_gives_0 = size_t(1) << (8 * sizeof(Index) - 3);
+  VERIFY(times_8_gives_0 * 8 == 0);
+
+  triggerMatrixBadAlloc<MatrixXf>(times_itself_gives_0, times_itself_gives_0);
+  triggerMatrixBadAlloc<MatrixXf>(times_itself_gives_0 / 4, times_itself_gives_0);
+  triggerMatrixBadAlloc<MatrixXf>(times_4_gives_0, 1);
+
+  triggerMatrixBadAlloc<MatrixXd>(times_itself_gives_0, times_itself_gives_0);
+  triggerMatrixBadAlloc<MatrixXd>(times_itself_gives_0 / 8, times_itself_gives_0);
+  triggerMatrixBadAlloc<MatrixXd>(times_8_gives_0, 1);
+
+  triggerVectorBadAlloc<VectorXf>(times_4_gives_0);
+
+  triggerVectorBadAlloc<VectorXd>(times_8_gives_0);
+}